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CVE-2026-3661· NVD / CVE Program· CNA VulDB

Wavlink WL-NU516U1 adm.cgi ota_new_upgrade command injection

A flaw has been found in Wavlink WL-NU516U1 240425. This affects the function ota_new_upgrade of the file /cgi-bin/adm.cgi. This manipulation of the argument model causes command injection. It is possible to initiate the attack remotely. The exploit has been published and may be used. The vendor was contacted early about this disclosure.

LowCVSS 2.0 · v4.0—No exploit No fix recorded

Noroxi analysis

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Published
Mar 7, 2026
Updated
Jun 17, 2026
EPSS
10.9% · 96th percentile
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Report tools

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Action score

11

Monitor

Low priority for now.

CVSS
8 / 40 · 2.0 / 10
CISA KEV
0 / 30 · Not listed
EPSS
3 / 30 · 10.9%

CISA SSVC decision

Exploitation
proof of concept
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · VulDB
5.1
NVD has not scored this yet; the score shown is the CNA’s.

CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Affected systems

VendorProduct
wavlinkwl-nu516u1 firmware
wavlinkwl-nu516u1

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • wavlink wl-nu516u1 firmwarem16u1_v240425

Versions reported by the vendor

Affected version ranges reported by the assigning authority (VulDB). Independent of NVD's CPE analysis and usually ahead of it.

  • Wavlink WL-NU516U1

    • 240425affected

Same product

wavlink: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-3703Wavlink NU516U1 login.cgi sub_401A10 out-of-bounds write
    35Monitor
  • CVE-2026-3612Wavlink WL-NU516U1 OTA Online Upgrade adm.cgi sub_405AF4 command injection
    32Monitor
  • CVE-2026-2615Wavlink WL-NU516U1 firewall.cgi singlePortForwardDelete command injection
    31Monitor
  • CVE-2026-4861Wavlink WL-NU516U1 nas.cgi ftext stack-based overflow
    29Monitor
  • CVE-2026-3613Wavlink WL-NU516U1 login.cgi sub_401A0C stack-based overflow
    29Monitor
  • CVE-2026-2567Wavlink WL-NU516U1 nas.cgi sub_401218 stack-based overflow
    29Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

No fix version is recorded for this entry. Check the references for vendor advisories.

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days-7% in 7 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2026-36122 days apartWavlink WL-NU516U1 OTA Online Upgrade adm.cgi sub_405AF4 command injection
    32Monitor
  • CVE-2026-261518 days apartWavlink WL-NU516U1 firewall.cgi singlePortForwardDelete command injection
    31Monitor
  • CVE-2025-10961163 days apartWavlink NU516U1 Delete_Mac_list wireless.cgi sub_4030C0 command injection
    22Monitor
  • CVE-2026-36620 days apartWavlink WL-NU516U1 adm.cgi usb_p910 command injection
    11Monitor
  • CVE-2026-37041 days apartWavlink NU516U1 Incomplete Fix CVE-2025-10959 firewall.cgi sub_405B2C command injection
    10Monitor
  • CVE-2025-10963163 days apartWavlink NU516U1 firewall.cgi sub_4016F0 command injection
    10Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • Administrator privileges are required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
Integrity
Availability
Attack vector
Network
Attack complexity
Low
Privileges required
High
User interaction
None
Scope
X

Weakness class (CWE)

CWE-74 · Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')

CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

Change log

No changes recorded on tracked fields yet. Score, KEV, exploit maturity and fix status changes appear here.

References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records